Kaiser Aluminum (KALU) EVP granted 1,686 restricted stock units in equity award

Rhea-AI Filing Summary

Kaiser Aluminum EVP Hugh J. Barger III received an equity grant in the form of restricted stock units. He acquired 1,686 shares of common stock at a grant price of $0.00 per share as a compensatory award, increasing his directly held stake to 5,711 shares.

The grant was made under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions on these restricted stock units are scheduled to lapse on March 5, 2029, or earlier if certain specified conditions are met.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Barger Hugh J. III

Role EVP - Sales & Marketing

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	1,686	$0.00	--

Holdings After Transaction: Common Stock, par value $0.01 per share — 5,711 shares (Direct)

Footnotes (1)

1. Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier upon the occurrence of certain specified circumstances. Shares acquired pursuant to grants of restricted stock units.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Barger Hugh J. III

(Last) (First) (Middle)

1550 W. MCEWEN DRIVE

SUITE 500

(Street)

FRANKLIN TN 37067

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
KAISER ALUMINUM CORP [ KALU ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP - Sales & Marketing

3. Date of Earliest Transaction (Month/Day/Year)
03/05/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.01 per share	03/05/2026		A		1,686(1)	A	$0(1)	5,711(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier upon the occurrence of certain specified circumstances.

2. Shares acquired pursuant to grants of restricted stock units.

	/s/ Cherrie I. Tsai, with power of attorney for Hugh J. Barger, III	03/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did Kaiser Aluminum (KALU) report for Hugh J. Barger III?

Kaiser Aluminum reported that EVP Hugh J. Barger III received a grant of 1,686 restricted stock units, equivalent to shares of common stock. The award was granted at $0.00 per share as part of his compensation under the company’s 2021 Equity and Incentive Compensation Plan.

How many Kaiser Aluminum (KALU) shares does Hugh J. Barger III hold after this Form 4?

After the reported grant, Hugh J. Barger III directly holds 5,711 shares of Kaiser Aluminum common stock. This total includes the newly awarded 1,686 restricted stock units, which were granted at no cash cost to him as part of equity compensation.

What type of equity award did Kaiser Aluminum (KALU) grant to Hugh J. Barger III?

Hugh J. Barger III received restricted stock units tied to Kaiser Aluminum common stock. These RSUs were granted under the 2021 Equity and Incentive Compensation Plan, with all restrictions scheduled to lapse on March 5, 2029, or earlier upon specified circumstances defined in the plan.

When do the restrictions on Hugh J. Barger III’s Kaiser Aluminum (KALU) RSU grant lapse?

All restrictions on Hugh J. Barger III’s restricted stock unit grant are set to lapse on March 5, 2029. The plan also allows for earlier vesting if certain specified circumstances occur, as outlined in the Kaiser Aluminum 2021 Equity and Incentive Compensation Plan documentation.

Was cash paid for the Kaiser Aluminum (KALU) shares reported in this Form 4?

No cash was paid for these shares. The 1,686 Kaiser Aluminum shares were acquired through a grant of restricted stock units at $0.00 per share, reflecting a compensatory equity award rather than an open-market purchase transaction by Hugh J. Barger III.